batgrbproduct Analysis for Trigger=349728
Analysis Summary
Notes:
- 1) No attempt has been made to eliminate the non-significant decimal places.
- 2) This batgrbproduct analysis is done of the amount of data for this trigger downloaded to date.
- 3) This page will be updated for up to 8 downlinks after the trigger.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.44
Process Start Time (local time): Wed Apr 22 13:04:34 EDT 2009
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger349728/GCN5_download_cron
======================================================================
Trigger: 00349728 Segment: 000
BAT Trigger Time: 262003687.808 [s; MET]
Trigger Stop: 262003714.688 [s; MET]
UTC: 2009-04-21T10:48:03.130780 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 302.23593793046 Dec: -87.423860787929 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 5.91
Image Trigger?: NO
Rate S/N Ratio: 16.062378404209 [ if not an image trigger ]
Image S/N Ratio: 5.91
Flight Position: [ source = BAT ]
RA: 302.23593793046 Dec: -87.423860787929 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 302.512031181091 Dec: -87.4242626666752 [deg; J2000]
{ 20h 10m 02.9s , -87d 25' 27.3" }
+/- 3.84567079406858 [arcmin] (estimated 90% radius based on SNR)
+/- 1.87498682864218 [arcmin] (formal 1-sigma fit error)
SNR: 4.44062342600609
Angular difference between Flight and Ground position is 0.744905 arcmin
Partial Coding Fraction: 0.8984375 [ including projection effects ]
Duration
T90: 26.8799999952316 +/-
Measured from: 0
to: 26.8799999952316 [s; relative to TRIGTIME]
T50: 26.8799999952316 +/-
Measured from: 0
to: 26.8799999952316 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 26.8799999952316 second)
Measured from: 0
to: 26.8799999952316 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 26.8799999952316 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.081580 0.156799 0.012745 0.018745
0.030116 0.028634 0.024300 0.022085 [error]
Peak 0.081580 0.156799 0.012745 0.018745
0.030116 0.028634 0.024300 0.022085 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
=== Fluence/Peak Flux Summary ===
Model Band1 Band2 Band3 Band4 Band5 Total
15-25 25-50 50-100 100-350 15-150 15-350 keV
Fluence Power-law 2.66e-08 4.02e-08 4.54e-08 9.76e-08 1.41e-07 2.12e-07 erg/cm2
Error 1.17e-08 1.25e-08 2.27e-08 1.05e-07 5.35e-08 1.28e-07 erg/cm2
Peak flux Power-law 3.21e-02 2.67e-02 1.51e-02 1.26e-02 7.95e-02 8.66e-02 ph/cm2/s
Error 1.45e-02 8.28e-03 7.31e-03 1.25e-02 2.47e-02 2.75e-02 ph/cm2/s
Fluence Cutoff-PL 2.62e-08 5.59e-08 1.50e-08 1.51e-10 9.72e-08 9.72e-08 erg/cm2
Error 1.09e-08 1.72e-08 1.68e-08 2.18e-09 3.01e-08 2.98e-08 erg/cm2
Peak flux Cutoff-PL 3.06e-02 3.78e-02 5.77e-03 3.15e-05 7.42e-02 7.42e-02 ph/cm2/s
Error 1.30e-02 1.12e-02 6.08e-03 4.27e-04 2.18e-02 2.18e-02 ph/cm2/s
Fluence Band 2.59e-08 5.12e-08 3.08e-08 1.92e-08 1.18e-07 1.24e-07 erg/cm2
Error 1.77e-08 1.58e-08 1.96e-08 3.57e-08 4.72e-08 5.40e-08 erg/cm2
Peak flux Band 2.40e-02 4.07e-02 6.68e-03 4.20e-04 7.35e-02 7.34e-02 ph/cm2/s
Error 1.20e-02 1.20e-02 8.47e-03 4.96e-03 2.12e-02 2.33e-02 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.824 0.585 - - 5.72e-04 2.14e-04 72.379 57
CPL 1.091 0.000 41.6 86.9 1.81e-03 0.00e+00 72.287 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.824 0.585 - - 5.72e-04 2.14e-04 72.379 57
CPL 1.091 0.000 41.6 86.9 1.81e-03 0.00e+00 72.287 0
Model : spectral model: simple power-law (PL) and cutoff power-law (CPL)
Ph_index : photon index: E^-{Ph_index} (minus sign is not included in the index)
Ph_90err : 90% error of the photon index
Epeak : Epeak in keV
Epeak_90err: 90% error of Epeak
Norm : normalization at 50 keV in PL model and at 1 keV in CPL model
Nomr_90err : 90% error of the normalization
chi2 : Chi-Squared
dof : degree of freedom
=== T90/T50 calculation in the 50-300 keV band (BATSE band) using 64 ms lc ===
T90 in the 50-300 keV band: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 26.880 0.000 26.880
T90 26.880 0.000 26.880
T50 26.880 0.000 26.880
Peak 26.880 0.000 26.880
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
302.5120 -87.4243 0.0436 15.3 -107.6 0.3939 4.4 TRIG_00349728
------------------------------------------
Foreground time interval of the image:
0.000 26.880 (delta_t = 26.880 [sec])
Background time interval of the image:
-60.808 -47.808 (delta_t = 13.000 [sec])
Lightcurves
Notes:
- 1) All plots contain as much data as has been downloaded to date.
- 2) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
- 3) For all the mask-weighted lightcurves, the y-axis units are counts/sec/det where a det is 0.4 x 0.4 = 0.16 sq cm.
- 4) The verticle lines correspond to following: green dotted lines are T50 interval, black dotted lines are T90 interval, blue solid line(s) is a spacecraft slew start time, and orange solid line(s) is a spacecraft slew end time.
- 5) Time of each bin is in the middle of the bin.
1 s binning
From T0-310 s to T0+310 s
From T100_start - 20 s to T100_end + 30 s
Full time interval
64 ms binning
Full time interval
From T100_start to T100_end
From T0-5 sec to T0+5 sec
16 ms binning
From T100_start-5 s to T100_start+5 s
8 ms binning
From T100_start-3 s to T100_start+3 s
2 ms binning
From T100_start-1 s to T100_start+1 s
SN=5 or 10 sec. binning (whichever binning is satisfied first)
SN=5 or 10 sec. binning (T < 200 sec)
Spectra
Notes:
- 1) The fitting includes the systematic errors.
- 2) For long bursts, a spectral fit of the pre-slew DRM will introduce some errors in both a spectral shape and a normalization if the PHA file contains a lot of the slew/post-slew time interval.
- 3) For fits to more complicated models (e.g. a power-law over a cutoff power-law), the BAT team has decided to require a chi-square improvement of more than 6 for each extra dof.
- 4) For short bursts (T90<1sec), the specrtum is also fit with Blackbody, OTTB, and Double Blackbody.
Time averaged spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 26.880 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.82352 ( -0.567040 0.603957 )
Norm@50keV : 5.718872E-04 ( -2.185333E-04 2.087625E-04) )
------------------------------------------------------------
Chi-Squared = 72.37917 using 59 PHA bins.
Reduced chi-squared = 1.269810 for 57 degrees of freedom
Null hypothesis probability = 8.238E-02
Photon flux (15-150 keV) in 26.88 sec: 7.953297E-02 ( -0.0246582 0.024664 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.41416e-07 ( -5.15792e-08 5.55034e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 26.880 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.09055 ( )
Epeak [keV] : 41.5649 ( -33.4393 140.386 )
Norm@50keV : 1.805304E-03 ( )
------------------------------------------------------------
Chi-Squared = 72.28658 using 59 PHA bins.
but latest trial 313.189 gives Chi-Squared = 2.72639
Reduced chi-squared = 1.290832 for 56 degrees of freedom
Null hypothesis probability = 7.044E-02
Photon flux (15-150 keV) in 26.88 sec: 7.419693E-02 ( -0.0217304 0.0218248 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.72392e-08 ( -2.95331e-08 3.07459e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 26.880 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.746744 ( -4.73319 7.794380E-03) )
beta : -2.28660 ( -6.905556E-02 0.518770 )
Epeak [keV] : 38.0980 ( -5.21834 5.81458 )
Norm@50keV : 3.127135E-03 ( -15.2956 29.4707 )
------------------------------------------------------------
Chi-Squared = 71.10899 using 59 PHA bins.
Reduced chi-squared = 1.292891 for 55 degrees of freedom
Null hypothesis probability = 7.085E-02
Photon flux (15-150 keV) in 26.88 sec: 7.348115E-02 ( -0.0214151 0.021081 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.1794e-07 ( -4.13388e-08 5.30566e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 26.880 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.82352 ( -0.567040 0.603957 )
Norm@50keV : 5.718872E-04 ( -2.185333E-04 2.087625E-04) )
------------------------------------------------------------
Chi-Squared = 72.37917 using 59 PHA bins.
Reduced chi-squared = 1.269810 for 57 degrees of freedom
Null hypothesis probability = 8.238E-02
Photon flux (15-150 keV) in 26.88 sec: 7.953297E-02 ( -0.0246582 0.024664 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.41416e-07 ( -5.15792e-08 5.55034e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 26.880 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.09055 ( )
Epeak [keV] : 41.5649 ( -33.4393 140.386 )
Norm@50keV : 1.805304E-03 ( )
------------------------------------------------------------
Chi-Squared = 72.28658 using 59 PHA bins.
but latest trial 313.189 gives Chi-Squared = 2.72639
Reduced chi-squared = 1.290832 for 56 degrees of freedom
Null hypothesis probability = 7.044E-02
Photon flux (15-150 keV) in 26.88 sec: 7.419693E-02 ( -0.0217304 0.0218248 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.72392e-08 ( -2.95331e-08 3.07459e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 26.880 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.746744 ( -4.73319 7.794380E-03) )
beta : -2.28660 ( -6.905556E-02 0.518770 )
Epeak [keV] : 38.0980 ( -5.21834 5.81458 )
Norm@50keV : 3.127135E-03 ( -15.2956 29.4707 )
------------------------------------------------------------
Chi-Squared = 71.10899 using 59 PHA bins.
Reduced chi-squared = 1.292891 for 55 degrees of freedom
Null hypothesis probability = 7.085E-02
Photon flux (15-150 keV) in 26.88 sec: 7.348115E-02 ( -0.0214151 0.021081 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.1794e-07 ( -4.13388e-08 5.30566e-08 ) ergs/cm2
Plot creation:
Wed Apr 22 13:12:24 EDT 2009